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Related Experiment Video

Updated: May 16, 2026

Techniques for Processing Eyes Implanted With a Retinal Prosthesis for Localized Histopathological Analysis

Techniques for Processing Eyes Implanted With a Retinal Prosthesis for Localized Histopathological Analysis

Published on: August 2, 2013

Reading visual braille with a retinal prosthesis.

Thomas Z Lauritzen¹, Jordan Harris, Saddek Mohand-Said

¹Second Sight Medical Products Sylmar, CA, USA.

Frontiers in Neuroscience

|November 29, 2012

Summary

This summary is machine-generated.

This study explored using the Argus II retinal prosthesis to present visual braille, enabling a blind patient to read letters and words by stimulating electrode arrays. The patient successfully identified a high percentage of letters and short words, showing promise for braille-based reading assistance.

Keywords:

blindness degeneration epiretinal prosthesis perception retina retinitis pigmentosa sensory substitution sight restoration

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Techniques for Processing Eyes Implanted with a Retinal Prosthesis for Localized Histopathological Analysis: Part 2 Epiretinal Implants with Retinal Tacks

Published on: February 14, 2015

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Techniques for Processing Eyes Implanted with a Retinal Prosthesis for Localized Histopathological Analysis: Part 2 Epiretinal Implants with Retinal Tacks

Published on: February 14, 2015

Area of Science:

Biomedical Engineering
Neuroscience
Ophthalmology

Background:

Retinal prostheses offer partial vision restoration for outer retinal degeneration.
Current retinal prosthesis systems like Argus II aid in reading but remain cumbersome.
Sensory substitution is a potential strategy to enhance reading for prosthesis users.

Purpose of the Study:

To investigate the feasibility of using an epiretinal prosthesis to stimulate visual braille for reading.
To assess the effectiveness of visual braille as a sensory substitution method for text comprehension.
To evaluate reading performance with a braille-based stimulation approach using the Argus II system.

Main Methods:

Utilized the Argus II retinal prosthesis system with its 10x6 electrode array.
Selected a 6-electrode grid to represent braille characters, bypassing camera input.
Stimulated electrode groups directly to create visual percepts of individual braille letters and short words in a single subject.

Main Results:

The subject achieved 89% accuracy in identifying single braille letters.
Reading accuracy for words was 80% for 2-letter, 60% for 3-letter, and 70% for 4-letter words.
Demonstrated successful stimulation and reading of text presented as visual braille.

Conclusions:

Text can be successfully stimulated and interpreted as visual braille by patients with retinal prostheses.
Visual braille presents a viable sensory substitution strategy to improve reading for individuals with visual impairments.
This approach holds potential for enhancing functional reading capabilities in retinal prosthesis users.